<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
</head>
<body>
<form action="form">
    <input type="text" class="form-control">
    <textarea class="form-control" cols="30" rows="10">Hello Word</textarea>

    <select name="" id="" class="form-control">
        <option value="">1</option>
        <option value="">2</option>
        <option value="">3</option>
        <option value="">4</option>
    </select>

    <input type="text" class="form-control" readonly placeholder="只读">
    <input type="text" class="form-control" disabled placeholder="禁用">
</form>
</body>
</html>